CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Accounts receivable, allowances for doubtful accounts	$ 12,283	$ 9,797
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	560,000	560,000
Common stock, shares issued	285,125	289,680
Common stock, shares outstanding	281,375	285,930
Treasury stock, shares	3,751	3,751